title: Circadian variations of potency of placebos on pain threshold in healthy teeth.
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D003080:Cold Temperature; D006801:Humans; D010146:Pain / Q000503:physiopathology*; D010919:Placebos; D012684:Sensory Thresholds / Q000187:drug effects; D013997:Time Factors; D014070:Tooth / Q000502:physiology*
chemical_list: D010919:Placebos